666525756 has 24 divisors (see below), whose sum is σ = 1674859984. Its totient is φ = 205084800.

The previous prime is 666525709. The next prime is 666525781. The reversal of 666525756 is 657525666.

666525756 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×666525756² = 888513166822743072, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2136145 + ... + 2136456.

Almost surely, 2^666525756 is an apocalyptic number.

It is an amenable number.

666525756 is an abundant number, since it is smaller than the sum of its proper divisors (1008334228).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

666525756 is a wasteful number, since it uses less digits than its factorization.

666525756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4272621 (or 4272619 counting only the distinct ones).

The product of its digits is 2268000, while the sum is 48.

The square root of 666525756 is about 25817.1601071845. The cubic root of 666525756 is about 873.5189119965.

The spelling of 666525756 in words is "six hundred sixty-six million, five hundred twenty-five thousand, seven hundred fifty-six".